Shape of Empirical and Synthetic Isoseismals: Comparison for Italian M \le 6 Earthquakes

Details Shape of Empirical and Synthetic Isoseismals: Comparison for Italian M \le 6 Earthquakes Shape of Empirical and Synthetic Isoseismals: Comparison for Italian M \le 6 Earthquakes

2010-07-05

arxiv.org/abs/1007.0630v1

Physics

Geophysics

Scientific paper

We present results from a comparative analysis of empirical and synthetic shapes for isoseismals of low intensity (I = IV-VI on the MCS scale) for six Italian earthquakes of ML = 4.5-6. Our modelling of isoseismals is based on a plane stratified earth model and on the dou-ble-couple point source approximation to calculate seismograms in the frequency range f =< 1 Hz. With a minimum of parameter variation we demonstrate that the low intensity isoseismals provide information on source geometry. We strive to avoid subjectivity in isoseismal construc-tions by using the new Diffuse Boundary method, which visualizes isoseismals with their uncer-tainty. Similar results in this direction are known for large earthquakes (ML ~ 6 or greater) with extended sources and for the higher isoseismals (I >= VI on the MM scale). The latter studies disregard the earth structure, use a greater number of parameters, and therefore have greater possibilities for fitting the data than our approach.

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